An earth energy transfer system with a moving energy transfer fluid, the system for transferring energy for an entity, the system, in certain aspects, having apparatus and related items for measuring an amount of energy transferred for the entity to or from the moving energy transfer fluid, and apparatus and related items for invoicing the entity for the amount of energy transferred. The power drive unit is operable to rotate and supply a rotational drive force. Techniques are described herein for selecting layers of a transmission on which to schedule control signaling and selecting offsets to apply to the control signaling scheduled on selected layers. The first nonmagnetic layer resides between the first pinned layer and the first free layer.